Move platform_thread to base/threading and put in the base namespace. I left ...

base/waitable_event_watcher_unittest.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
-#include "base/platform_thread.h"
+#include "base/threading/platform_thread.h"
 #include "base/waitable_event.h"
 #include "base/waitable_event_watcher.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::WaitableEvent;
 using base::WaitableEventWatcher;
 
 namespace {
 
 class QuitDelegate : public WaitableEventWatcher::Delegate {
@@ skipping 57 matching lines @@
   WaitableEventWatcher watcher;
 
   int counter = 1;
   DecrementCountDelegate delegate(&counter);
 
   watcher.StartWatching(&event, &delegate);
 
   event.Signal();
 
   // Let the background thread do its business
-  PlatformThread::Sleep(30);
+  base::PlatformThread::Sleep(30);
 
   watcher.StopWatching();
 
   MessageLoop::current()->RunAllPending();
 
   // Our delegate should not have fired.
   EXPECT_EQ(1, counter);
 }
 
 void RunTest_OutlivesMessageLoop(MessageLoop::Type message_loop_type) {
@@ skipping 60 matching lines @@
 // Crashes sometimes on vista.  http://crbug.com/62119
 #define MAYBE_DeleteUnder DISABLED_DeleteUnder
 #else
 #define MAYBE_DeleteUnder DeleteUnder
 #endif
 TEST(WaitableEventWatcherTest, MAYBE_DeleteUnder) {
   RunTest_DeleteUnder(MessageLoop::TYPE_DEFAULT);
   RunTest_DeleteUnder(MessageLoop::TYPE_IO);
   RunTest_DeleteUnder(MessageLoop::TYPE_UI);
 }